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Is epoxy primer rain proof?

S

SDE

Well-known Member
I have some tractor parts that I was only able to get the primer on tonight. I see that there is a 60% chance of rain tomorrow morning. Will it be ok to let them get wet before i paint them?
SDE
 
I can only speak for PPG/Omni epoxy. YES it has exterior properties and doesn't need topcoated. That being said, I would NOT use a rag to wipe dry. Use a leaf blower or your air nozzle on your air line. Wiping down a product that is designed for a chemical bond may be asking for trouble.
 
Thank you, I would need to move my car out of the garage to make room for the parts otherwise.
SDE
 
Doesn't matter what you do you will still have to sand the surface with 120 to 400 grit to get a good bond. Once you let the item to be painted set over night you have to sand it.
Getting wet isn't the issue.
 
as far as I know (which isn't very far) epoxy primer is water proof, unlike all other primers. That's one reason I like to use it, as I often have to let primed parts sit for a while - plus I feel it gives extra protection later when the top coat gets scratched.

I've had primed parts sit in the rain many times with no ill effects.

As others have said - once it sits a while, it must be scuffed up. Probably a good idea anyways if it gets wet. This is an important step that can't be skipped.

I like scotchbrite scuff pads - much faster and more effective than sandpaper, especially with lots of nooks and crannies.
 
Depending on the brand , a top brand like PPG/Omni does NOT require or recommend scuffing unless it sits longer than re-coat window. For Omni it is 3 days and PPG DP line it is at least 5 days. A mechanical bond (sanding/scuffing) is inferior and inconsistant to a chemical bond.
 
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